US Patent 10155529 Multi-function convertible trailer and towing structure

A trailer having a framework configured for selectively switching between a wheel-based towing mechanism and a ski-based towing mechanism and wherein the trailer framework is lightweight and configured for supporting an enclosed trailer that may be constructed of lightweight composite paneling. The trailer framework can also be used with a pivotable and removable tow-bar where the tow-bar is configured with a plurality of pivotable attachment points for pivotably securing to the framework. The tow-bar is also connectable to any tow-vehicle and can be removed from the tow-vehicle and the trailer framework when not in use, or can be pivoted upwardly about the trailer framework for storage.